Suspension Spring Adjusting Apparatus of Hydraulic Shock Absorber

ABSTRACT

In a suspension spring adjusting apparatus of a hydraulic shock absorber, a mounting structure of a motor to a spring adjusting case is constituted by a three-point support structure in a plan view including a motor shaft of the motor.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a suspension spring adjusting apparatusof a hydraulic shock absorber.

2. Description of the Related Art

Conventionally, as a suspension spring adjusting apparatus of ahydraulic shock absorber, there is a structure in which a piston rod isinserted to a cylinder. A spring adjusting jack is provided in an outerperiphery of the cylinder, a jack chamber is provided in a springadjusting case in which the spring adjusting jack is fixed to an outerperiphery of the cylinder, a plunger is provided in the jack chamber. Apump supplying a hydraulic pressure to the jack chamber is installed inthe spring adjusting case. A motor driving the pump is provided in thespring adjusting case, the motor is covered by a case cover attached tothe spring adjusting case. A suspension spring is interposed between aspring receiver supported to the plunger of the spring adjusting jackand a spring receiver provided in a piston rod side.

Alternatively, Japanese Patent Application Laid-open No. 2001-88528(patent document 1), discloses a motor mounting structure in a pressureoil supply and discharge apparatus of a vehicle height adjustingapparatus, wherein there is a structure in which one end flange portionextending in an axial direction of a motor is fixed to a gear housing bya plurality of bolts.

In the suspension spring adjusting apparatus of the hydraulic shockabsorber, in the case that the structure described in the patentdocument 1 is employed as the motor mounting structure to the springadjusting case, the motor is supported in a cantilever manner in a planview including the motor shaft. Accordingly, a bending stress generatedin the motor mounting portion tends to become excessive, and it isnecessary that great strength is provided in the motor mounting portion.

SUMMARY OF THE INVENTION

An object of the present invention is to reduce a strength required fora mounting portion of a motor to a spring adjusting case, in asuspension spring adjusting apparatus of a hydraulic shock absorber.

The present invention relates to a suspension spring adjusting apparatusof a hydraulic shock absorber comprising: a piston rod inserted to acylinder; a spring adjusting jack provided in an outer periphery of thecylinder; a jack chamber provided in a spring adjusting case in whichthe spring adjusting jack is fixed to the outer periphery of thecylinder, wherein a plunger is provided in the jack chamber, a pumpsupplying a hydraulic pressure to the jack chamber is installed in thespring adjusting case, a motor driving the pump is provided in thespring adjusting case, and the motor is covered by a case cover attachedto the spring adjusting case; and a suspension spring interposed betweena spring receiver supported by the plunger of the spring adjusting jackand a spring receiver provided on a side of the piston rod. A mountingstructure of the motor to the spring adjusting case is constituted by athree-point support structure in a plan view including a motor shaft ofthe motor.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be more fully understood from the detaileddescription given below and from the accompanying drawings which shouldnot be taken to be a limitation on the invention, but are forexplanation and understanding only.

The drawings:

FIG. 1 is a perspective view showing a hydraulic shock absorber;

FIG. 2 is a cross sectional view showing the hydraulic shock absorber;

FIG. 3 is a front elevational view showing a motor mounting state to aspring adjusting case;

FIG. 4 is a cross sectional view along a line IV-IV in FIG. 3;

FIG. 5 is a cross sectional view schematically showing a cross sectionalong a line V-V in FIG. 3;

FIG. 6 is a back elevational view showing the spring adjusting case;

FIGS. 7A to 7C show a motor, in which FIG. 7A is a front elevationalview, FIG. 7B is a side elevational view and FIG. 7C is a backelevational view;

FIG. 8 is a front elevational view showing the spring adjusting case;

FIG. 9 is a cross sectional view showing a communication between a jackchamber of the spring adjusting case and a pump chamber;

FIG. 10 is a cross sectional view showing the spring adjusting case;

FIGS. 11A to 11C show a case cover, in which FIG. 11A is a crosssectional view, FIG. 11B is a front elevational view and FIG. 11C is aback elevational view;

FIG. 12 is an enlarged cross sectional view showing a skirt portion ofthe case cover;

FIG. 13 is a cross sectional view showing a mounting structure of thespring adjusting case and the case cover;

FIG. 14 is a cross sectional view showing a pump;

FIG. 15 is a plan view showing a harness assembly;

FIG. 16 is a cross sectional view showing a harness insertion structureto the spring adjusting case;

FIG. 17 is a cross sectional view showing a harness guide;

FIG. 18 is a cross sectional view showing a cap;

FIG. 19 is a schematic cross sectional view along a line XIX-XIX in FIG.3;

FIGS. 20A to 20C show a mounting stay, in which FIG. 20A is a crosssectional view, FIG. 20B is a side elevational view and FIG. 20C is aplan view; and

FIGS. 21A and 21B show a mounting holder, in which FIG. 21A is a crosssectional view and FIG. 21B is a side elevational view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A hydraulic shock absorber 10 is structured, as shown in FIGS. 1 and 2,such that a hollow piston rod 12 is inserted to a cylinder 11, and asuspension spring 13 is interposed in outer side portions of thecylinder 11 and the piston rod 12.

The cylinder 11 is provided with a vehicle body side mounting member 14,and the piston rod 12 is provided with an axle side mounting member 15.A spring adjusting jack 60A of a suspension spring adjusting apparatus60 in detail mentioned below is provided in an outer peripheral portionof the cylinder 11, and a spring receiver 17 is supported thereto. Aspring receiver 18 is fixed to the axle side mounting member 15 in thepiston rod 12, the suspension spring 13 is interposed between the springreceiver 17 and the spring receiver 18, and a set length of thesuspension spring 13 can be adjusted by the spring adjusting jack 60A.An elastic force of the suspension spring 13 absorbs an impact forcewhich a vehicle receives from a road surface. Reference symbol 13Adenotes a spring cover.

The cylinder 11 is provided with a rod guide 21 through which the pistonrod 12 passes. In this case, the cylinder 11 is provided with a bumpstopper cap 22 in an outer side of the rod guide 21, and it is possibleto regulate a maximum compressive stroke by bringing the bump stoppercap 22 into collision with a bump rubber 23 provided in the piston rod12, at a time of peak compression. Further, the cylinder 11 is providedwith a rebound rubber 24 in an inner side of the rod guide 21.

The hydraulic shock absorber 10 has a piston valve apparatus (acompression side and expansion side damping force generating apparatus)30. The hydraulic shock absorber 10 suppresses an expanding andcontracting vibration of the cylinder 11 and the piston rod 12 inaccordance with an absorption of an impact force by the suspensionspring 13, on the basis of a damping force generated by the piston valveapparatus 30.

The piston valve apparatus 30 is structured such that a piston 31 isfixed to an end portion of the piston rod 12, an inner portion of thecylinder 11 is sectioned to a piston side oil chamber 33A in which thepiston rod 12 is not accommodated, and a rod side oil chamber 33B inwhich the piston rod 12 is accommodated, and a disc-like compressionside damping valve 34 and a disc-like expansion side damping valve 35are respectively provided in a compression side oil path and anexpansion side oil path communicating between the piston side oilchamber 33A and the rod side oil chamber 33B provided in the piston 31.

The piston valve apparatus 30 has a damping force adjusting apparatus40. The damping force adjusting apparatus 40 can adjust an expansionside damping force by moving forward and backward an adjusting rod 42inserted to a hollow portion of the piston rod 12 by means of a motor 41installed in the axle side mounting member 15, and adjusting an openingarea of a bypass oil path 43 provided in the hollow portion of thepiston rod 12 in such a manner as to communicate the piston side oilchamber 33A with the rod side oil chamber 33B by means of a leading endneedle valve 42A of the adjusting rod 42.

The hydraulic shock absorber 10 has a base valve apparatus (acompression side damping force generating apparatus) 50. The base valveapparatus 50 is provided with a partition wall member 51 in an innerportion of the cylinder 11, is provided with a reservoir chamber 52sectioned from the piston side oil chamber 33A by the partition wallmember 51, and defines a gas chamber 52A at the back of the reservoirchamber 52 by means of a rubber-like diaphragm 53 fitted to an outerperiphery in a side of the reservoir chamber 52 of the partition wallmember 51. The base valve apparatus 50 is provided with a disc-likeexpansion side damping valve (a check valve) 54 and a disc-likecompression side damping valve 55 respectively in an expansion side oilpath and a compression side oil path communicating between the pistonside oil chamber 33A and the reservoir chamber 52 provided in thepartition wall member 51.

In order to apply a position dependency to the compression side dampingforce by the compression side damping valve 55 of the base valveapparatus 50, the hydraulic shock absorber 10 is provided with acommunication path 56 communicating the piston side oil chamber 33A withthe reservoir chamber 52 in the partition wall member 51, and isprovided with a control rod 57 fitting the piston rod 12 to thecommunication path 56 via a small gap after compressing the piston rod12 at a fixed stroke in the piston rod 12.

Accordingly, a damping operation of the hydraulic shock absorber 10 isas follows.

(Compressing Time)

(a) When a moving speed of the piston rod 12 is low, the oil in thepiston side oil chamber 33A moves to the rod side oil chamber 33B via abypass oil path 43 of the piston rod 12, and the compression sidedamping force is obtained on the basis of a throttle resistancegenerated by the needle valve 42A during this time.

(b) When the moving speed of the piston rod 12 is middle or high, in asmall stroke stage in which the control rod 57 is not yet fitted to thecommunication path 56, in addition to the damping force in the item (a)mentioned above, the oil in the piston side oil chamber 33A moves to therod side oil chamber 33B through the compression side oil path of thepiston 31, and the compression side damping force is obtained by adeflecting deformation of the compression side valve 34 during thistime.

(c) When the moving speed of the piston rod 12 is middle or high, in alarge stroke stage in which the control rod 57 is fitted to thecommunication path 56, in addition to the damping forces in the items(a) and (b) mentioned above, the oil in the piston side oil chamber 33Amoves to the reservoir chamber 52 through the compression side oil pathof the partition wall member 51, and the compression side damping forceis obtained by a deflecting deformation of the compression side valve 55during this time.

In this case, in the items (a) to (c) mentioned above, the oil at avolumetric capacity at which the piston rod 12 moves forward into thecylinder 11 is extruded to the reservoir chamber 52 from the piston sideoil chamber 33A through the communication path 56 or the oil path of thepartition wall member 51 so as to be compensated.

(Expanding Time)

(a) When the moving speed of the piston rod 12 is low, the oil in therod side oil chamber 33B moves to the piston side oil chamber 33A fromthe bypass oil path 43 of the piston rod 12, and the expansion sidedamping force is obtained on the basis of a throttle resistancegenerated by the needle valve 42A during this time.

(b) When the moving speed of the piston rod 12 is middle or high, inaddition to the damping force in the item (a) mentioned above, the oilin the rod side oil chamber 33B moves to the piston side oil chamber 33Athrough the expansion side oil path of the piston 31, and the expansionside damping force is obtained by a deflecting deformation of theexpansion side valve 35 during this time.

In this case, in the items (a) and (b) mentioned above, the oil at avolumetric capacity at which the piston rod 12 moves backward from thecylinder 11 is returned to the piston side oil chamber 33A through theoil path of the partition wall member 51 or the communication path 56from the reservoir 52 so as to be compensated.

A description will be given below of a suspension spring adjustingapparatus 60 of the hydraulic shock absorber 10. The suspension springadjusting apparatus 60 is provided with a spring adjusting jack 60A inan outer periphery of the cylinder 11, as shown in FIGS. 1 to 6. Thespring adjusting jack 60A is structured such that a jack chamber 62 isprovided in a spring adjusting case 61 fixed to the outer periphery ofthe cylinder 11. A plunger 63 is slidably provided in the jack chamber62, a pump 70 supplying a hydraulic pressure to the jack chamber 62 isinstalled in the spring adjusting case 61, a motor 80 driving the pump70 is provided in the spring adjusting case 61, and the motor 80 iscovered by a case cover 90 attached to the spring adjusting case 61.Further, as mentioned above, the suspension spring 13 is interposedbetween the spring receiver 17 supported to the plunger 63 of the springadjusting jack 60A and the spring receiver 18 provided in the side ofthe piston rod 12, and a spring force of the suspension spring 13 can beadjusted by adjusting a set length of the suspension spring 13 on thebasis of a vertical movement of the plunger 63 and the spring receiver17 by means of the spring adjusting jack 60A.

The spring adjusting jack 60A is structured, as shown in FIGS. 2 and 3,such that the sleeve 19 is fitted to an outer periphery of the cylinder11, and is locked in an axial direction by a stop ring 11A (FIG. 2). Thejack housing 61A of the spring adjusting case 61 is inserted andattached to the sleeve 19 via an O-ring 64, and is locked in an axialdirection by a stop ring 19A (FIG. 3). The plunger 63 is slidably fittedto the jack chamber 62 between the sleeve 19 and the jack housing 61Avia O-rings 63A and 63B (FIG. 3). Reference symbol 19B (FIG. 3) denotesa slidable end regulating stop ring of the plunger 63. The springadjusting jack 60A is structured by uniting a structure provided withthe spring receiver 17 in the plunger 63.

The spring adjusting jack 60A has a pump 70 built-in the pump housing61B of the spring adjusting case 61, as shown in FIG. 4. The pump 70 isstructured, as shown in FIGS. 4 and 14, such that a tubular holder 71 isfixed to the pump housing 61B in accordance with a screwing, and a driveshaft 73 is supported by a thrust bearing 72 provided in the holder 71.One end of the drive shaft 73 is formed as a hexagonal shaft 73A coupledto the motor 80, and a leveling nut 74 is screwed to the other endthread shaft 73B in such a manner as to pinch a rebound rubber 74A withrespect to a flange 73C. A pin 75 is implanted in an outer periphery ofthe nut 74, and the pin 75 is locked into a linear guide groove 71Aprovided in an axial direction of an inner surface of the holder 71. Aleveling piston 76 is slidably inserted to the pump chamber 70A of thepump housing 61B via an O-ring 76A, and the piston 76 is brought intocollision with a leading end surface of the nut 74 so as to be supportedby a back surface. In the spring adjusting case 61, the jack chamber 62within the jack housing 61A and the pump chamber 70A within the pumphousing 61B are communicated by a communication path 70B as shown inFIGS. 8 to 10. In FIG. 4, reference numeral 77 denotes a plug, andreference symbol 77A denotes an O-ring. Accordingly, when the motor 80rotates forward and backward the drive shaft 73 of the pump 70, the pin75 of the leveling nut 74 engaged with the drive shaft 73 is guided bythe guide groove 71A of the holder 71 so as to linearly reciprocate thenut 74, and the leveling piston 76 to which the nut 74 is supported bythe back surface moves forward and backward within the pump chamber 70A.As a result, the oil within the pump chamber 70A is supplied anddischarged to the jack chamber 62 of the spring adjusting jack 60A viathe communication path 70B, and vertically moves the plunger 63 of thejack 60A and the spring receiver 17 by extension.

The spring adjusting jack 60A attaches the motor driving the pump 70within a profile of a mounting mating surface 65 to the case cover 90 inthe spring adjusting case 61. The motor 80 is structured, as shown inFIGS. 7A to 7C, such that a speed reducer 81 is integrally provided in aleading end side, and the hexagonal shaft 73A of the drive shaft 73 ofthe pump 70 is fitted and coupled to a hexagonal hole 82A provided in anoutput shaft 82 of the speed reducer 81.

The spring adjusting jack 60A is structured, as shown in FIGS. 2, 4 and5, such that the motor 80 is covered by a closed-end case cover 90attached to the spring adjusting case 61. A mounting mating surface 91is aligned with a mounting mating surface 65 of the spring adjustingcase 61, and a mounting screw 69 inserted to a mounting hole 65A (FIGS.8 to 10) formed so as to pass through an external portion at five pointsin the mounting mating surface 65 of the spring adjusting case 61 isfixed to a mounting hole 92 (FIGS. 11A to 11C) provided incorrespondence to the mounting mating surface 91 of the case cover 90,as shown in FIGS. 3 and 6.

In the spring adjusting jack 60A, as shown in FIGS. 1 and 2, a pluralityof harnesses 101 (a harness 101A for feeding power and a harness 101Bfor sensor) such as a feeder line, a signal line or the like connectedto a control portion of the power source and the hydraulic shockabsorber 10 are inserted to an inner portion of the spring adjustingcase 61 from a harness insertion hole 110 provided in the springadjusting case 61 so as to be connected to a socket 88 of the motor 80.A plurality of harnesses 101 structure a harness assembly 100 as shownin FIG. 15, and the harnesses 101 are coated by a single tube 102 so asto be united into one bundle. In FIG. 15, reference numerals 103 and 104denote a vehicle body side connecting socket previously fixed bycaulking to one end side of the harness 101, and reference numeral 105denotes a socket previously fixed to the other end side of the harness101 so as to be connectable to the socket 88 of the motor 80. In thiscase, a harness 44 connected to the motor 41 of the damping forceadjusting apparatus 40 is extended to inner and outer sides of the axleside mounting bracket 15.

Accordingly, in the spring adjusting jack 60A of the suspension springadjusting apparatus 60, (A) a mounting structure between the springadjusting case 61 and the case cover 90, (B) a waterproof seal structurebetween the spring adjusting case 61 and the case cover 90, (C) aharness insertion structure of the spring adjusting case 61, and (D) amounting structure of the motor 80 are made as follows.

(A) Mounting Structure Between Spring Adjusting Case 61 and Case Cover90 (FIGS. 11A to 11C and 12)

The spring adjusting jack 60A is structured such that when aligning themounting mating surface 91 with the mounting mating surface 65 of thespring adjusting case 61 and fixing them by the mounting screw 69, themounting mating surfaces 65 and 91 are sealed by an endlesscircumferential seal member 93 as shown in FIGS. 4 and 5, and themounting screw 69 of the spring adjusting case 61 and the case cover 90is arranged closer to an outer side of the case cover 90 than the sealmember 93. The seal member 93 is loaded to an endless circumferentialseal loading groove 91A extending along a profile of the mounting matingsurface 91 within a surface of the mounting mating surface 91 of thecase cover 90, and is compressed with respect to the mounting matingsurface 65 of the spring adjusting case 61. The case cover 90 isstructured such that the mounting mating surface 91 around the mountinghole 92 for the mounting screw 69 is formed so as to protrude to aninner side of the cover 90, and the circular arc-shaped seal loadinggroove 91A surrounding the mounting hole 92 is provided in theprotruding portion of the mounting mating surface 91, and the circulararc-shaped seal loading groove 91A is smoothly connected to the sealloading groove 91A provided in the other portion of the mounting matingsurface 91.

In this case, the harness 101 connected to the motor 80 is inserted tothe harness insertion hole 110 of the spring adjusting case 61 via aseal means 120 in detail mentioned below.

In accordance with the present embodiment, the following operation andeffect can be achieved.

(a) The spring adjusting case 61 and the mounting mating surfaces 65 and91 of the case cover 90 are sealed by the endless circumferential sealmember 93, and the mounting screw 69 of the spring adjusting case 61 andthe case cover 90 is arranged closer to the outer side of the case coverthan to the seal member 93. Accordingly, the mounting screw 69 does notrequire a seal treatment such as a potting seal, a packing or the like,there is no risk that an inferior quality is generated by a sealtreatment miss, and an internal portion of the case cover 90 is sealedby the seal member 93 so as to be waterproofed.

(b) Although the spring adjusting case 61 is provided with the harnessinsertion hole 110 through which the harness 101 connected to the motor80 passes, the harness 101 is inserted to the harness insertion hole 110via the seal means 120 so as to be waterproofed.

(B) Waterproof Seal Structure of Spring Adjusting Case 61 and Case Cover90 (FIGS. 4, 5 and 11A to 13)

The spring adjusting jack 60A is structured, as shown in FIGS. 4, 5 and13, such that the mounting mating surfaces 65 and 91 sealed by the sealmember 93 of the spring adjusting case 61 and the case cover 90 areformed in a flat surface shape, and an annular skirt portion 94 isprovided in a protruding manner in an outer peripheral edge extendingover an entire periphery around the mounting mating surface 91 of thecase cover 90 (FIGS. 11A to 11C and 12). The annular skirt portion 94surrounds an outer peripheral side surface around the mounting matingsurface 65 of the spring adjusting case 61 via a gap A so as to coverover.

In this case, a motor mounting seat surface 67 for a motor mountingspacer 68 provided in the spring adjusting case 61 is simultaneouslyworked in a flat surface shape which is flush formed with the mountingmating surface 65 for the case cover 90. The motor 80 is mounted to themounting seat surface 67 of the spring adjusting case 61 via the spacer68 as mentioned above. The mounting seat surface 66 for the motormounting stay 85 provided in the spring adjusting case 61 is alsosimultaneously worked in a flat surface shape which is flush formed withthe mounting mating surface 65 for the case cover 90.

In accordance with the present embodiment, the following operations andeffects can be achieved.

(a) Since the skirt portion 94 in the outer peripheral edge of the casecover 90 covers the outer peripheral surface of the spring adjustingcase 61, a high-pressure washing water is not directly applied to theouter edges of the mounting mating surfaces 65 and 91 of the springadjusting case 61 and the case cover 90, a load of the seal member 93against the direct intruding water is lost, and it is possible toimprove a waterproof seal performance in the inner portion of the casecover 90.

(b) The skirt portion 94 in the outer peripheral edge of the case cover90 has the gap with respect to the outer peripheral surface of thespring adjusting case 61, it is unnecessary to work the skirt portion 94of the case cover 90 and work the outer peripheral surface of the springadjusting case 61, and a precision for forming by a metal mold issufficient. Accordingly, the mounting portion of the spring adjustingcase 61 and the case cover 90 can be sufficiently worked by forming themounting mating surfaces 65 and 91 thereof in the flat surface shape, itis possible to reduce the working man hour and it is easy to manage thedimension.

(c) The mounting seat surface 67 of the motor 80 provided in the springadjusting case 61 is formed in the flat surface shape which is flushformed with the mounting mating surface 65 to the case cover 90, and themotor 80 is attached to the mounting seat surface 67 via the spacer 68.Accordingly, it is possible to simultaneously work the mounting seatsurface 67 of the motor 80 provided in the spring adjusting case 61 andthe mounting mating surface 65 for the case cover 90, and it is possibleto reduce the working man hour.

(C) Harness Inserting Structure of Spring Adjusting Case 61 (FIGS. 5, 6,7A to 7C and 15 to 18)

The spring adjusting jack 60A is structured, as shown in FIG. 5, suchthat the spring adjusting case 61 is previously provided with theharness insertion hole 110 having a larger aperture diameter than theouter size of the socket 105 in the harness assembly 100, in such amanner as to insert the socket 105 of the harness 101 to the springadjusting case 61 under a state of being assembled in the outerperiphery of the cylinder 11 from the outer side. The harness 101 of theharness assembly 100 is inserted to the harness insertion hole 110 viathe seal means 120 in a watertight manner.

The harness insertion hole 110 provided in the spring adjusting case 61is constituted by a two-stage hole having a first hole 111 provided inthe inner surface side of the spring adjusting case 61 and facing to theinner portion of the spring adjusting case 61, and a second hole 112provided in the outer surface side of the spring adjusting case 61 andfacing to the outer portion of the spring adjusting case 61, as shown inFIG. 16. In the present embodiment, the first hole 111 and the secondhole 112 are constituted by a round hole and coaxially provided. A holediameter D2 of the second hole 112 is larger than a hole diameter D1 ofthe first hole 111, and the hole diameter D1 of the first hole 111 islarger than the outer size of the socket 105.

The seal means 120 is constituted by a harness guide 121 and a cap 122,as shown in FIGS. 15 and 16.

The harness guide 121 is constituted by a rubber body approximatelyformed in a thick disc shape, as shown in FIG. 17. The harness guide 121is provided with a flange 121A engaging with an outer edge of an outerend of the first hole 111 of the spring adjusting case 61, and a hook121B locking to an outer edge of an inner end of the first hole 111, andis provided with a plurality of hole-shaped harness insertion paths 121Cwhich can insert a plurality of harnesses 101, in a penetrating manner.When pressure inserting the harness guide 121 to which the harness 101is inserted to the first hole 111, the harness guide 121 is compressedso as to reduce a diameter of the harness insertion path 121C, andinserts the harness 101 in a watertight manner while bringing an annularcrimple 121D into pressure contact with the harness 101.

The cap 122 is constituted by a rubber body approximately formed in an Lshape, as shown in FIG. 18. The cap 122 is provided with a flange 122Aelastically locking and attaching to an inner periphery of a back end ofthe second hole 112 of the spring adjusting case 61 in a base end side,is provided with a core metal 122B in an inner portion of the flange122A, and is provided with a tube insertion path 122C in a leading endportion. The tube insertion path 122C is provided with a plurality ofannular crimples 122D brought into pressure contact with the outerperiphery of the tube 102 of the harness assembly 100, and can pressureinsert and hold one end of the tube 102 in a waterproof manner.

The harness assembly 100 is inserted and attached to the harnessinsertion hole 110 of the spring adjusting case 61 in the followingmanner.

(1) The socket 105 of the harness assembly 100 is inserted to theharness insertion hole 110 of the spring adjusting case 61 which isfinished being assembled the hydraulic shock absorber 10, and is underthe state of being assembled in the outer periphery of the cylinder 11,from the outer side. The socket 105 is connected to the socket 88 of themotor 80.

(2) The harness guide 121 inserted and attached to the harness 101 ispressure inserted to the first hole 111 of the harness insertion hole110 so as to be fixed. The flange 121A of the harness guide 121 isengaged with the outer edge of the outer end of the first hole 111, andthe hook 121B is locked to the outer edge of the inner end of the firsthole 111.

(3) The cap 122 inserted and attached to the tube 102 is pressureinserted to the second hole 112 of the harness insertion hole 110 so asto be fixed. The flange 122A of the cap 122 is locked and attached tothe inner periphery of the back end of the second hole 112. In a statein which the harness guide 121 and the cap 122 are respectively pressureinserted to the first hole 111 and the second hole 112 of the springadjusting case 61, the harness insertion path 121C of the harness guide121 and the harness insertion path 122C of the cap 122 are arranged soas to be approximately orthogonal, as shown in FIG. 16.

In accordance with the present embodiment, the following operations andeffects can be achieved.

(a) The spring adjusting case 61 is previously provided with the harnessinsertion hole 110 being larger than the outer size of the socket 105 insuch a manner as to insert the connecting socket 105 provided in theharness 101 connected to the motor 80 to the spring adjusting case 61 ofthe spring adjusting jack 60A under the state of being assembled in theouter periphery of the cylinder 11, and the harness 101 is inserted tothe harness insertion hole 110 via the seal means 120. Accordingly,after the hydraulic shock absorber 10 is provided with the springadjusting case 61 of the spring adjusting jack 60A, the socket 105provided in the harness 101 is inserted into the case 61 from theharness insertion hole 110 of the spring adjusting case 61, and thesocket 105 can be connected to the motor 80 which is already provided inthe spring adjusting case 61. It is possible to improve an assemblingworkability of the hydraulic shock absorber 10 by after assembling theharness 101, it is possible to separate the spring adjusting case 61 andthe harness 101 in a parts distribution stage, and providing andhandling properties thereof are improved.

(b) The harness insertion hole 110 provided in the spring adjusting case61 is constituted by the two-stage hole having the first hole 111 in theinner surface side of the spring adjusting case 61, and the second hole112 in the outer surface side of the spring adjusting case 61, theharness guide 121 inserting the harness 101 in the watertight manner ispressure inserted to the first hole 111, and the cap 122 inserting thetube 102 coated by the harness 101 in the watertight manner is pressureinserted to the second hole 112. Accordingly, it is possible to improvea come-off preventing performance such as a sealing performance of theharness 101 introduced to the spring adjusting case 61.

(c) In a state in which the harness guide 121 and the cap 122 arepressure inserted respectively to the first and second holes of thespring adjusting case 61, the harness insertion path 121C of the harnessguide 121 and the tube insertion path 122C of the cap 122 are arrangedso as to be orthogonal to each other. Accordingly, it is possible tofurther improve a shielding performance against the high-pressurewashing water which is going to make an intrusion into the springadjusting case 61, and a come-off preventing performance against anexternal pulling force applied to the harness 101, by the harness guide121 and the cap 122.

(D) Mounting Structure of Motor 80 (FIGS. 3, 5, 7A to 7C, 8, 19 to 21Aand 21B)

The spring adjusting jack 60A is structured such that the mountingstructure of the motor 80 to the spring adjusting case 61 is made asshown in FIGS. 3 and 5. The motor 80 is supported at three points in aplan view as shown in FIG. 3 including the motor shaft (not shown) ofthe motor 80.

The three-point supporting structure of the motor 80 is constituted by astructure in which two mounting bosses 84 provided in the speed reducer81 arranged in the leading end side of the motor 80 is fixed by amounting bolt 87 and a washer 87A, and a structure in which a mountingholder 86 wound around a mounting convex portion 83 protruding to anouter side from a terminal end side of the motor 80 in a direction alongthe motor shaft is screwed to a mounting stay 85 provided in the springadjusting case 61 in a rising manner by a locking screw 86C.

The speed reducer 81 is provided with the mounting bosses 84 mentionedabove at two points on the flat surface which is orthogonal to theoutput shaft 82, one mounting boss 84 is provided with a round hole 84A(a positioning reference hole) for the bolt 87, and the other mountingboss 84 is provided with an oblong hole 84B for the bolt 87 (FIGS. 7A to7C). Further, the cylindrical spacer 68 is raised on the motor mountingseat surfaces 67 (FIG. 8) provided at two points of the mounting matingsurface 65 of the spring adjusting case 61, and the mounting bolts 87mentioned above inserted to the round hole 84A and the oblong hole 84Bof the mounting bosses 84 at two points of the motor 80 are insertedthrough the hollow portion of the spacer 68 so as to be screwed with themounting hole 67A of the motor mounting seat surface 67.

The spring adjusting case 61 is structured, as shown in FIGS. 5 and 19,such that a stay mounting hole 66A and a stay rotation preventing hole66B are provided in the stay mounting seat surface 66 (FIG. 8) providedin the mounting mating surface 65, a mounting leg 85A of the mountingstay 85 is seated on the stay mounting seat surface 66, a rotationpreventing pin 85C notched and bent in the mounting leg 85A is lockedinto the stay rotation preventing hole 66B, and a mounting screw 85D isinserted into a thread hole of the mounting leg 85A and screwed to thestay mounting hole 66A (FIGS. 20A to 20C). Both side mounting pieces 86Aof the mounting holder 86 wound around the mounting convex portion 83 ofthe motor 80 are fixed to a rising mounting surface 85B of the mountingstay 85 by a locking screw 86C inserted to the slit-shaped screwing hole86B provided in the mounting piece 86A (FIGS. 21A and 21B).

In the spring adjusting jack 60A, as shown in FIG. 3, a center 80G ofgravity of the motor 80 is arranged in a triangle obtained by connectingthree points (the mounting bolts 87 and the mounting screw 85D) of thethree-point support structure of the motor 80.

Accordingly, a mounting procedure of the motor 80 is as follows.

(1) The mounting leg 85A of the mounting stay 85 is seated on the staymounting seat surface 66 provided in the mounting mating surface 65 ofthe spring adjusting case 61, the rotation preventing pin 85C of themounting stay 85 is locked into the stay rotation preventing hole 66B ofthe stay mounting seat surface 66, the mounting screw 85D of themounting stay 85 is screwed to the stay mounting hole 66A of the staymounting seat surface 66, and the mounting stay 85 is raised.

(2) The mounting bosses 84 at two points of the motor 80 are set to thespacer 68 raised on the motor mounting seat surface 67 at two points ofthe mounting mating surface 65 of the spring adjusting case 61, thebolts 87 respectively inserted to the round hole 84A and the oblong hole84B of the mounting bosses 84 at two points are inserted to the hollowportion of the spacer 68 so as to be temporarily tightened to themounting hole 67A of the motor mounting seat surface 67, and themounting convex portion 83 of the motor 80 is brought into contact withthe mounting surface 85B of the mounting stay 85.

(3) The bolt 87 is inserted into the round hole 84A of the mounting boss84 and is fully tightened to the mounting hole 67A of the motor mountingseat surface 67, and the bolt 87 is inserted into the oblong hole 84B ofthe mounting boss 84 and fully tightened to the mounting hole 67A of themotor mounting seat surface 67. On the basis of the fastening androtating force of the bolt 87, the mounting convex portion 83 of themotor 80 is pressed against the mounting surface 85B of the mountingstay 85 so as to be closely attached.

(4) The mounting holder 86 is wound around the mounting convex portion83 of the motor 80, and the mounting holder 86 is fixed to the mountingsurface 85B of the mounting stay 85 by the locking screw 86C.

At this time, in the item (3) mentioned above, a mounting error in adirection X of the motor 80 is absorbed by applying the mounting convexportion 83 of the motor 80 to the mounting surface 85B of the mountingstay 85 in the fastening and rotating direction of the bolt 87 (FIG.19). Further, a mounting error in a direction Y of the motor 80 isabsorbed by forming the screwing hole 86B of the mounting holder 86 inthe item (4) mentioned above as a slot (FIG. 19). Further, a mountingerror in a direction Z of the motor 80 is absorbed by arranging themounting holder 86 in the item (4) mentioned above away from the motor80 in the direction along the motor shaft of the motor 80 (FIG. 5).

In accordance with the present embodiment, the following operations andeffects can be achieved.

(a) The mounting structure of the motor 80 to the spring adjusting case61 is set to the three-point support structure in a plan view includingthe motor shaft of the motor 80. Accordingly, a bending stress generatedin the mounting portion of the motor 80 to the spring adjusting case 61is reduced, and it is possible to reduce a strength necessary for themounting portion. Thereby, a weight saving of the suspension springadjusting apparatus 60 is achieved.

(b) The three-point support structure in the item (a) mentioned above ofthe motor 80 is structured by the structure of fixing two mountingbosses 84 provided in the speed reducer 81 arranged in the leading endside of the motor 80 to the spring adjusting case 61 by the bolt 87, andthe structure of screwing the mounting holder wound around the mountingconvex portion 83 provided in the terminal end side of the motor 80 tothe mounting stay 85 provided in a rising manner on the spring adjustingcase 61. Accordingly, it is possible to simply and securely support themotor 80 by three points.

(c) Since the center 80G of gravity of the motor 80 is arranged in thetriangle obtained by connecting three points of the three-point supportstructure of the motor 80, it is possible to further reduce the bendingstress generated in the mounting portion of the motor 80 to the springadjusting case 61 in the item (a) mentioned above.

(d) The mounting error of the motor 80 in the direction X can beabsorbed by bringing the mounting convex portion 83 of the motor 80 intocontact with the mounting surface 85B of the mounting stay 85 in thefastening and rotating direction of the bolt 87, the mounting error ofthe motor 80 in the direction Y can be absorbed by forming the screwinghole 86B of the holder as the slit, and the mounting error of the motor80 in the direction Z can be absorbed by moving the holder away from themotor 80 in the direction along the motor shaft. It is possible toabsorb the working error or the like of the mounting position providedin the spring adjusting case 61. It is possible to attach the motor 80to the spring adjusting case 61 and within reason, any abnormal stressesare not generated in each of the mounting portions. Thereby, it ispossible to prevent a deterioration of the performance of the motor 80caused by an application of an offset load or the like to the motor 80,and a durability of the motor 80 is improved. Further, a workingprecision of each of the parts and a parts precision can be absorbed.

As heretofore explained, embodiments of the present invention have beendescribed in detail with reference to the drawings. However, thespecific configurations of the present invention are not limited to theillustrated embodiments but those having a modification of the designwithin the range of the presently claimed invention are also included inthe present invention.

Although the invention has been illustrated and described with respectto an exemplary embodiment thereof, it should be understood by thoseskilled in the art that the foregoing and various other changes,omissions and additions may be made to the present invention withoutdeparting from the spirit and scope thereof. Therefore, the presentinvention should not be understood as limited to the specific embodimentset out above, but should be understood to include all possibleembodiments which can be encompassed within a scope of equivalentsthereof with respect to the features set out in the appended claims.

1. A suspension spring adjusting apparatus of a hydraulic shock absorbercomprising: a piston rod inserted to a cylinder; a spring adjusting jackprovided in an outer periphery of the cylinder; a jack chamber providedin a spring adjusting case in which the spring adjusting jack is fixedto the outer periphery of the cylinder, wherein a plunger is provided inthe jack chamber, a pump supplying a hydraulic pressure to the jackchamber is installed in the spring adjusting case, a motor driving thepump is provided in the spring adjusting case, and the motor is coveredby a case cover attached to the spring adjusting case; and a suspensionspring interposed between a spring receiver supported to the plunger ofthe spring adjusting jack and a spring receiver provided on a side ofthe piston rod, wherein a mounting structure of the motor to the springadjusting case is constituted by a three-point support structure in aplan view including a motor shaft of the motor.
 2. A suspension springadjusting apparatus of a hydraulic shock absorber as claimed in claim 1,wherein the three-point support structure of the motor is constituted bya structure of fixing two mounting bosses provided in a speed reducerarranged in a leading end side of the motor to the spring adjusting caseby a bolt, and a structure of screwing a mounting holder wound around amounting protrusion provided in a terminal end side of the motor to amounting stay provided in a rising manner on the spring adjusting case.3. A suspension spring adjusting apparatus of a hydraulic shock absorberas claimed in claim 1, wherein a center of gravity of the motor isarranged in a triangle obtained by connecting three points of thethree-point support structure of the motor.
 4. A suspension springadjusting apparatus of a hydraulic shock absorber as claimed in claim 2,wherein a center of gravity of the motor is arranged in a triangleobtained by connecting three points of the three-point support structureof the motor.
 5. A suspension spring adjusting apparatus of a hydraulicshock absorber as claimed in claim 2, wherein a mounting error in adirection X of the motor is absorbed by applying the mounting protrusionof the motor to a mounting surface of the mounting stay in a fasteningand rotating direction of the bolt, wherein a mounting error in adirection Y of the motor is absorbed by forming the screwing hole of themounting holder as a slot, and wherein a mounting error in a direction Zof the motor is absorbed by arranging the mounting holder away from themotor in the direction along the motor shaft.
 6. A suspension springadjusting apparatus of a hydraulic shock absorber as claimed in claim 3,wherein a mounting error in a direction X of the motor is absorbed byapplying the mounting protrusion of the motor to a mounting surface ofthe mounting stay in a fastening and rotating direction of the bolt,wherein a mounting error in a direction Y of the motor is absorbed byforming the screwing hole of the mounting holder as a slot, and whereina mounting error in a direction Z of the motor is absorbed by arrangingthe mounting holder away from the motor in the direction along the motorshaft.
 7. A suspension spring adjusting apparatus of a hydraulic shockabsorber as claimed in claim 4, wherein a mounting error in a directionX of the motor is absorbed by applying the mounting protrusion of themotor to a mounting surface of the mounting stay in a fastening androtating direction of the bolt, wherein a mounting error in a directionY of the motor is absorbed by forming the screwing hole of the mountingholder as a slot, and wherein a mounting error in a direction Z of themotor is absorbed by arranging the mounting holder away from the motorin the direction along the motor shaft.
 8. A suspension spring adjustingapparatus of a hydraulic shock absorber as claimed in claim 2, whereinthe speed reducer is provided with the two mounting bosses at two pointson a plane which is orthogonal to an output shaft of the speed reducer,wherein a round hole for the bolt is provided in one mounting boss, andwherein an oblong hole for the bolt is provided in the other mountingboss.
 9. A suspension spring adjusting apparatus of a hydraulic shockabsorber as claimed in claim 3, wherein the speed reducer is providedwith the two mounting bosses at two points on a plane which isorthogonal to an output shaft of the speed reducer, wherein a round holefor the bolt is provided in one mounting boss, and wherein an oblonghole for the bolt is provided in the other mounting boss.
 10. Asuspension spring adjusting apparatus of a hydraulic shock absorber asclaimed in claim 4, wherein the speed reducer is provided with the twomounting bosses at two points on a plane which is orthogonal to anoutput shaft of the speed reducer, wherein a round hole for the bolt isprovided in one mounting boss, and wherein an oblong hole for the boltis provided in the other mounting boss.
 11. A suspension springadjusting apparatus of a hydraulic shock absorber as claimed in claim 5,wherein the speed reducer is provided with the two mounting bosses attwo points on a plane which is orthogonal to an output shaft of thespeed reducer, wherein a round hole for the bolt is provided in onemounting boss, and wherein an oblong hole for the bolt is provided inthe other mounting boss.
 12. A suspension spring adjusting apparatus ofa hydraulic shock absorber as claimed in claim 6, wherein the speedreducer is provided with the two mounting bosses at two points on aplane which is orthogonal to an output shaft of the speed reducer,wherein a round hole for the bolt is provided in one mounting boss, andwherein an oblong hole for the bolt is provided in the other mountingboss.
 13. A suspension spring adjusting apparatus of a hydraulic shockabsorber as claimed in claim 7, wherein the speed reducer is providedwith the two mounting bosses at two points on a plane which isorthogonal to an output shaft of the speed reducer, wherein a round holefor the bolt is provided in one mounting boss, and wherein an oblonghole for the bolt is provided in the other mounting boss.
 14. Asuspension spring adjusting apparatus of a hydraulic shock absorber asclaimed in claim 8, wherein a motor mounting seat surface is provided attwo points of a mounting mating surface with the case cover in thespring adjusting case, a cylindrical spacer is raised on the motormounting seat surface, and the mounting bolt inserted to each of theround hole and the oblong hole of two mounting bosses in the speedreducer of the motor is screwed to a mounting hole of the motor mountingseat surface through a hollow portion of the spacer.
 15. A suspensionspring adjusting apparatus of a hydraulic shock absorber as claimed inclaim 9, wherein a motor mounting seat surface is provided at two pointsof a mounting mating surface with the case cover in the spring adjustingcase, a cylindrical spacer is raised on the motor mounting seat surface,and the mounting bolt inserted to each of the round hole and the oblonghole of two mounting bosses in the speed reducer of the motor is screwedto a mounting hole of the motor mounting seat surface through a hollowportion of the spacer.
 16. A suspension spring adjusting apparatus of ahydraulic shock absorber as claimed in claim 10, wherein a motormounting seat surface is provided at two points of a mounting matingsurface with the case cover in the spring adjusting case, a cylindricalspacer is raised on the motor mounting seat surface, and the mountingbolt inserted to each of the round hole and the oblong hole of twomounting bosses in the speed reducer of the motor is screwed to amounting hole of the motor mounting seat surface through a hollowportion of the spacer.
 17. A suspension spring adjusting apparatus of ahydraulic shock absorber as claimed in claim 11, wherein a motormounting seat surface is provided at two points of a mounting matingsurface with the case cover in the spring adjusting case, a cylindricalspacer is raised on the motor mounting seat surface, and the mountingbolt inserted to each of the round hole and the oblong hole of twomounting bosses in the speed reducer of the motor is screwed to amounting hole of the motor mounting seat surface through a hollowportion of the spacer.
 18. A suspension spring adjusting apparatus of ahydraulic shock absorber as claimed in claim 14, wherein a stay mountingseat surface is provided in a mounting mating surface with the casecover in the spring adjusting case, the stay mounting seat surface isprovided with a stay mounting hole and a stay rotation preventing hole,a mounting leg of the mounting stay is seated on the stay mounting seatsurface, a rotation preventing pin formed in the mounting leg bynotching and bending is locked into the stay rotation preventing hole,and the mounting screw inserted to the thread hole of the mounting legis screwed to the stay mounting hole.
 19. A suspension spring adjustingapparatus of a hydraulic shock absorber as claimed in claim 15, whereina stay mounting seat surface is provided in a mounting mating surfacewith the case cover in the spring adjusting case, the stay mounting seatsurface is provided with a stay mounting hole and a stay rotationpreventing hole, a mounting leg of the mounting stay is seated on thestay mounting seat surface, a rotation preventing pin formed in themounting leg by notching and bending is locked into the stay rotationpreventing hole, and the mounting screw inserted to the thread hole ofthe mounting leg is screwed to the stay mounting hole.
 20. A suspensionspring adjusting apparatus of a hydraulic shock absorber as claimed inclaim 16, wherein a stay mounting seat surface is provided in a mountingmating surface with the case cover in the spring adjusting case, thestay mounting seat surface is provided with a stay mounting hole and astay rotation preventing hole, a mounting leg of the mounting stay isseated on the stay mounting seat surface, a rotation preventing pinformed in the mounting leg by notching and bending is locked into thestay rotation preventing hole, and the mounting screw inserted to thethread hole of the mounting leg is screwed to the stay mounting hole.